Kaufman's argument is simplistic. Religion is cultural, not genetic. You're not born religious, you're indoctrinated into religion by your parents and/or influential adults around you. What you can believe, you can also unbelieve. Most atheists (in the US) today are former believers.
Furthermore, the fastest growing religious demographic in developed countries such as in Europe and North America, is 'none': http://www.dailymail.co.uk/news/article-2250096/You-wouldnt-believe-atheism-worlds-biggest-faith-Christianity-Islam.html
And last, but not least, the internet is where religions come to die: https://www.youtube.com/watch?v=0Rqw4krMOug
. As long as the internet is around and people use it, more and more people will overcome religion.